<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>
<script>
    var arr = [1,3,2,7,5];
    var arr1 = ["老王","老宋","老李","老张"];
    alert(arr1.reverse());
</script>
